javascript format date

gistfile1.txt

function formatDate(date, format) {
            if (typeof date === "string") {
                var mts = date.match(/(\/Date\((\d+)\)\/)/);
                if (mts && mts.length >= 3) {
                    date = parseInt(mts[2]);
                }
            }
            
            date = new Date(date);
            if (!date || date.toUTCString() == "Invalid Date") {
                return "";
            }
            var map = {
                "M": date.getMonth() + 1, //月份
                "d": date.getDate(), //日
                "h": date.getHours(), //小时
                "m": date.getMinutes(), //分
                "s": date.getSeconds(), //秒
                "q": Math.floor((date.getMonth() + 3) / 3), //季度
                "S": date.getMilliseconds() //毫秒
            };
            
            if (!format) {
                format = 'yyyy-MM-dd hh:mm:ss';
            }
            format = format.replace(/([yMdhmsqS])+/g, function(all, t){
                var v = map[t];
                if(v !== undefined){
                    if(all.length > 1){
                        v = '0' + v;
                        v = v.substr(v.length-2);
                    }
                    return v;
                }
                else if(t === 'y'){
                    return (date.getFullYear() + '').substr(4 - all.length);
                }
                return all;
            });
            return format;
}